Yeast infections are driven by an overgrowth of Candida, a fungus that naturally lives in the vagina in small amounts. Preventing them comes down to keeping conditions unfavorable for that overgrowth: maintaining the vagina’s natural acidity, controlling moisture, and avoiding products and habits that disrupt the microbial balance. Most prevention strategies are simple daily choices, and they work because they protect the Lactobacillus bacteria that keep Candida in check.
Skip the Feminine Hygiene Products
The single most impactful thing you can do is stop using products inside or around the vagina that interfere with its natural ecosystem. The vagina is self-cleaning, and its healthy pH sits between 3.8 and 4.5, acidic enough to suppress harmful organisms on its own. Disrupting that environment is one of the fastest routes to infection.
Douching is the clearest offender. It increases the risk of bacterial vaginosis, pelvic inflammatory disease, and preterm birth during pregnancy. Even douching with plain water temporarily washes out protective Lactobacillus bacteria, and vinegar douches are no substitute. The lactic acid produced by healthy vaginal bacteria works differently from acetic acid (vinegar), so you can’t replicate the effect.
Other products carry surprising risk. Gel sanitizers designed for intimate use have been associated with an eight times higher risk of yeast infection and nearly a 20-fold higher risk of bacterial infection. Intimate washes and vaginal cleansers are linked to a 3.5 times higher risk of bacterial infection. Even lubricants and moisturizing creams correlate with a 2.5 times higher risk of yeast infection. Researchers believe certain ingredients in these products eliminate the good microbes that fight off infection. If you want to wash the vulva (the external area), warm water or a gentle, fragrance-free soap is enough.
Choose the Right Underwear and Clothing
Candida thrives in warm, moist environments, so anything that traps heat and moisture against the skin gives it an advantage. Cotton underwear is the best choice because it wicks away sweat and moisture that yeast feeds on, and it’s less likely to cause allergic reactions than synthetic fabrics. If you see underwear made from synthetic material with a cotton crotch panel, that small strip doesn’t fully protect you and won’t breathe the way 100% cotton does.
Beyond fabric choice, avoid sitting in wet swimsuits or sweaty workout clothes for extended periods. Change into dry clothing as soon as you can. Tight-fitting pants and pantyhose can also create a humid environment, so looser fits help when yeast infections are a recurring issue.
Be Careful During and After Antibiotic Use
Antibiotics are one of the most common triggers for yeast infections because they kill bacteria broadly, including the Lactobacillus species that keep Candida populations low. You can’t always avoid antibiotics when you need them, but you can take steps to reduce the fallout.
If you’ve had yeast infections after antibiotics before, let your prescriber know. They may recommend a preventive antifungal alongside the antibiotic course. Taking a probiotic during and after antibiotics may also help restore beneficial bacteria faster, though the evidence is stronger for some strains than others (more on that below). The CDC notes that corticosteroids also raise candidiasis risk, so the same awareness applies if you’re on those.
Probiotics as a Preventive Tool
Probiotics containing Lactobacillus strains show real promise for preventing recurrent yeast infections, particularly when combined with standard antifungal treatment. In clinical trials totaling 388 participants, adding probiotics to antifungal therapy cut the one-month relapse rate by about 66% compared to antifungal treatment alone. One controlled trial found even more dramatic results: recurrence dropped to 33% with probiotics versus 92% without them at three months, and to 29% versus 100% at six months.
The strains most commonly studied include L. rhamnosus, L. acidophilus, and L. reuteri. You can find these in oral capsules or in some yogurt products, though capsule doses tend to be more standardized. The evidence is encouraging but still based on relatively small trials, so probiotics are best thought of as a helpful addition to other prevention habits rather than a standalone solution.
Watch Your Blood Sugar
Candida feeds on sugar, and elevated blood glucose creates a more hospitable environment for yeast to multiply. People with diabetes are significantly more susceptible to yeast overgrowth, and poorly controlled blood sugar is a well-established risk factor for recurrent infections.
Even without diabetes, chronically high sugar intake can contribute. You don’t need to follow an extreme elimination diet, but if you’re getting frequent yeast infections and your diet is heavy on refined carbohydrates and added sugars, reducing your intake is a reasonable step. Keeping blood sugar stable through balanced meals with protein, fiber, and healthy fats makes the vaginal environment less friendly to Candida.
Hormonal Factors to Consider
Higher estrogen levels increase the risk of yeast infections. This is why infections are more common during pregnancy, in people taking birth control pills that raise estrogen, and in those on hormone replacement therapy. Estrogen promotes glycogen production in vaginal cells, which Candida can use as fuel.
If you notice a pattern of yeast infections that tracks with your birth control, talk to your provider about switching to a lower-estrogen option or a non-hormonal method. Some people also notice infections clustering around certain points in their menstrual cycle when estrogen peaks, which is normal but worth tracking so you can be proactive with other prevention habits during those windows.
Habits Around Sex
Sexual activity can introduce irritants and shift the vaginal environment in ways that promote yeast growth. A few specific habits help reduce that risk. If a finger, toy, or penis has been in contact with the anus, wash it thoroughly or use a fresh condom before vaginal contact. Clean sex toys carefully between uses according to their instructions, and wash menstrual cups the same way.
Some lubricants and spermicides cause irritation that disrupts vaginal flora. If you notice symptoms after using a particular product, switch brands or try a different type. Water-based, fragrance-free lubricants tend to be the least irritating. Urinating after sex is often recommended for UTI prevention, and while the evidence for yeast infection prevention specifically is thinner, it doesn’t hurt.
When Yeast Infections Keep Coming Back
Recurrent vulvovaginal candidiasis, defined as three or more episodes in a year, affects fewer than 5% of women. If you fall into this category, the prevention strategies above still apply but may not be enough on their own. CDC guidelines recommend a longer initial treatment course (7 to 14 days instead of the typical short course) to fully clear the infection, followed by a six-month maintenance regimen to prevent relapse.
Maintenance therapy is effective at controlling recurrent infections, but it rarely provides a permanent cure. Antifungal resistance is also becoming more common, so if infections persist despite treatment, susceptibility testing can determine whether the yeast strain is responding to standard medications. Recurrent infections warrant working closely with a provider who can tailor a longer-term plan rather than treating each episode in isolation.